Dust mask



FIG. 1 is a front perspective view of a dust mask showing our newdesign, the person shown in broken lines forms no part of the claimeddesign;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines on the mask represent conventional stitching. Thecrosshatch shading is understood to repeat throughout the indicatedarea.

An ornamental design for a dust mask, as shown and described.